| Variable | Type | Len | Description |
| AGE | Integer | 1 | Age groups (in years)
1 = 25 - 34 2 = 35 - 44 3 = 45 - 54 4 = 55 - 64 5 = 65 - 74 6 = 75+ |
| ALC | Integer | 1 | Alcohol consumption (in grams per day)
1 = 0 - 39 2 = 40 - 79 3 = 80 - 119 4 = 120+ |
| TOB | Integer | 1 | Tobacco consumption (in graphs per day)
1 = 0 - 9 2 = 10 - 19 3 = 20 - 29 4 = 30+ |
| ESOPH_CA | Integer | 1 | Case or control:
1 = case 2 = control |
| AGE2 | Alpha | 10 | Age dichotomized as:
"older" = 55 + years "younger" = < 55 years |
| ALC2 | Alpha | 10 | Alcohol consumption dichotomized as:
high/vhigh = 80+ gms/day low/med = < 80 gms/day |
| TOB2 | Alpha | 10 | Tobacco consumption dichotomized:
high/vhigh = 20+ gms/day low/med = < 20 gms/day |